<?php
function showFormats($format=null){
    if($format){
        setlocale(LC_ALL, $format);
    }
    echo "\nFormats ($format):";
    echo "\n";
    echo strftime("%A %e %B %Y ");
    echo "\n";
    echo 3923414.2332;
    echo "\n";
    echo "\n";
    
}
echo "<pre>";
showFormats();
showFormats('nl_NL');
showFormats('da_DK');
showFormats('fr_FR');
showFormats('de_DE');